alpha 0.3.0 version - panic: runtime error:

[fenix011]

When using 0.3.0-alpha.1/Paperboy_0.3.0-alpha.1_Linux_64bit binary pre-compiled i get the following 'panic error' :

jordi@sirio:~/Html/paperboy5$ paperboy send life-coaching pilot
Loading template content/life-coaching.md
Loading recipients lists/pilot.yaml
Sending an email every 1s via 3 workers
[0] Starting worker...
Retrying SMTP dial on error:  EOF
Retrying SMTP dial on error:  EOF
Retrying SMTP dial on error:  EOF
[0] Stopping worker...
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xad84e1]

goroutine 33 [running]:
github.com/rykov/paperboy/mail.(*deliverer).startWorker.func1()
	/home/runner/work/paperboy/paperboy/mail/sender.go:136 +0x121
created by github.com/rykov/paperboy/mail.(*deliverer).startWorker
	/home/runner/work/paperboy/paperboy/mail/sender.go:133 +0x146

Hope it helps !